PLUMED2 - v2.0.1

We released an updated plumed (v2.0.1). It contains several fixes from previous v2.0.0. Many of them were done as a consequence of your feedbacks on the mailing list, which are precious and greatly acknowledged.

Main changes are:

- Fixed a bug in HISTOGRAM with REWEIGHT_BIAS. Reweighting was only done when also temperature-reweighing was enabled.

- Fixed a bug that was sometime crashing code with domain decomposition and